Emergence and evolution of $k$-gap in spectra of liquid and supercritical states

Abstract

Fundamental understanding of strongly-interacting systems necessarily involves collective modes, but their nature and evolution is not generally understood in dynamically disordered and strongly-interacting systems such as liquids and supercritical fluids. We report the results of extensive molecular dynamics simulations and provide direct evidence that liquids develop a gap in solid-like transverse spectrum in the reciprocal space, with no propagating modes between zero and a threshold value. In addition to the liquid state, this result importantly applies to the supercritical state of matter. We show that the emerging gap increases with the inverse of liquid relaxation time and discuss how the gap affects properties of liquid and supercritical states.

References in corpus (10)

• Testing Mode-Coupling Theory for a Supercooled Binary Lennard-Jones Mixture II: Intermediate Scattering Function and Dynamic Susceptibility
• Microscopic dynamics in liquid metals: the experimental point of view
• Two liquid states of matter: A new dynamic line on a phase diagram
• Collective modes and thermodynamics of the liquid state
• "Liquid-gas" transition in the supercritical region: Fundamental changes in the particle dynamics
• High frequency longitudinal and transverse dynamics in water
• Frenkel Line and Solubility Maximum in Supercritical Fluids
• Understanding the problem of glass transition on the basis of elastic waves in a liquid
• Thermally triggered phononic gaps in liquids at THz scale
• Direct links between dynamical, thermodynamic and structural properties of liquids: modelling results

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